What is the stance of Islam on discussing philosophies, beliefs, ideas, and practices of other religions or belief systems?

What are the rules or guidelines on how a Muslim should engage with others who would like to discuss philosophies, beliefs, ideas, and practices of other religions or belief systems? - Are Muslims allowed to discuss / engage in the ideas to some degree? Or is it shunned. - How does Islam incorporate ideas outside the main canon / system? _(Generally speaking)_ - Are certain topics to be never discussed? This would help me ask better questions to the Muslim community in general, but also would serve as a gauge as to how to interact. Basically, what is acceptable conversation topics in the end.